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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 14,433 $ 12,734
Stockholders' Equity:    
Preferred stock, par value (in USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 53,609,000 53,396,000
Treasury stock (in shares) 1,871,000 353,000